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Étude expérimentale des fluctuations d'origine quantique en amplification paramétrique d'images

Abstract : This dissertation presents an experimental study of spatial quantum fluctuations of light in optical parametric amplification (OPA). First, we characterize the response of a CCD camera for the measurement of the spatial shot noise in the image transverse plane. We show the high capabilities of silicon arrays for the visible domain (527 nm) contrary to its bad response in the near IR domain (1055 nm). Then, we use a calibration method of the sensitivity of pixels to eliminate inhomogeneities and to retrieve shot noise for high and low intensity levels. Next, we study the quantum aspects of OPA. The best experimental solution is to amplify a shot noise limited image (527 nm) by a UV pump (264 nm) in a type I BBO cristal. We define an experimental scheme and a protocol of measurement to compare the phase sensitive amplification scheme (PSA) and the phase insensitive amplification scheme (PIA). For the PIA case, we show the degradation of the signal to noise ratio. And for the PSA case, we achieved the first spatially noiseless amplification of images. For both cases, experimental values are in good agreement with theoretical noise figure. Moreover, we study the spatial fluctuations of parametric fluorescence. Using short pulses combined with a narrow spectral filter, we directly characterize a pure distribution of Bose-Einstein
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Contributor : Alexis Mosset <>
Submitted on : Thursday, May 26, 2005 - 7:10:53 PM
Last modification on : Thursday, November 12, 2020 - 9:42:07 AM
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  • HAL Id : tel-00009322, version 1


Alexis Mosset. Étude expérimentale des fluctuations d'origine quantique en amplification paramétrique d'images. Physique Atomique [physics.atom-ph]. Université de Franche-Comté, 2004. Français. ⟨tel-00009322⟩



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